However, In most cases, you will most likely not notice any symptoms except the check engine light with the P0420 code stored in the engine control module or powertrain control module (PCM). In rare cases, you may also notice issues like misfires, higher fuel consumption, or a bad odor smell from the exhaust pipe.
The most common symptom of code P0420 is a check engine light on your car’s dashboard. However, here are some things that could fix the error code P0420: You will most likely waste your money by just replacing parts, so it is much better to make a proper diagnosis. You should first check the function of the catalytic converter with the methods further down in the article before replacing any parts.
Misfires (damaging the catalytic converter). Rich/lean mixture (damaging the catalytic converter). Wrong type of fuel (leaded fuel instead of unleaded). Exhaust manifold or exhaust system leak. Damaged upstream or downstream oxygen sensor / faulty wirings. Incorrect placement of the catalytic converter. Oil contamination in the catalytic converter. Damaged catalytic converter (most common). The main causes of the P0420 code include: If the car’s air-fuel mixture is incorrect due to a faulty injector, high fuel pressure, faulty fuel system, or a damaged sensor, it may cause the catalytic converter to not function properly. Because of this, the catalytic converter will not become hot enough and it will trigger the P0420 trouble code. I have also seen non-OEM catalytic converters that have been installed too far away from the engine on the exhaust pipe towards the last muffler. Some cheaper catalysts may not be efficient enough, and it could result in you may need to buy a brand new catalyst from the manufacturer. It may be a defective bad catalyst, but I have also seen many cases when the catalyst is new but is not an original OEM part. It can also be caused by a faulty oxygen sensor, exhaust system leak, intake leak, or incorrect placement of the catalytic converter. The most common cause of the P0420 code is a faulty catalytic converter. What are some possible causes of a P0420? In most cases, a P0420 trouble code is caused by a bad catalytic converter.Īn incorrect air-fuel mixture can also temporarily or permanently reduce the catalyst’s efficiency, resulting in a PO420 code. If the catalyst system efficiency is low, the P0420 code will be triggered. The engine control module (ECM) uses two O2 sensors, one in front of and one behind the catalytic converter to measure its efficiency. It can either be caused by a faulty catalyst or a false alarm caused by a faulty O2 sensor. The P0420 code indicates that the ECM has detected underperformance of the catalytic converter’s efficiency on Bank 1. P0420 – Catalyst System Efficiency Below Threshold (Bank 1) What does the P0420 Code Mean?
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